Heterobimetallic complexes stabilized by chiral phenoxy-functionalized
prolinolate are highly active in catalyzing the epoxidation of α,β-unsaturated
ketones, while the enantioselectivity varies according to the ionic radii of the
rare earth center. A series of chalcone derivatives were converted to chiral
epoxides in good ee at 0°C using TBHP as the oxidant.